Abstract :
D. C. Prince: There are, in general, two ways of regarding such waves as those set up by commutating devices whether of rotating or static character. Fig. 4, in Mr. Lennox´s paper, is typical of the waves encountered. Such a wave may be regarded as made up of a series of constant-amplitude waves of different frequencies, as Mr. Lennox has done, or it may be regarded as a succession of simple states.
